--- a
+++ b/features/rgb_gr.py
@@ -0,0 +1,49 @@
+import os
+import cv2
+
+# data_path = 'test/'
+# out_path = 'res/'
+# filelist = os.listdir(data_path)
+
+def trans(img):
+    ht = img.shape[0]
+    wd = img.shape[1]
+    for i in range(0,ht):
+        for j in range(0,wd):
+            B = img[i][j][0]
+            G = img[i][j][1]
+            R = img[i][j][2]
+            if B <= 51:
+                img[i][j][0] = 255
+            elif B <= 102:
+                img[i][j][0] = 255 - (B-51)*5
+            elif B <= 153:
+                img[i][j][0] = 0
+            else : img[i][j][0] = 0
+
+            if G <= 51:
+                img[i][j][1] = G*5
+            elif G <= 102:
+                img[i][j][1] = 255
+            elif G <= 153:
+                img[i][j][1] = 255
+            elif G <= 204:
+                img[i][j][1] = 255 - int(128.0*(G-153.0)/51.0 + 0.5)
+            else : img[i][j][1] = 127 - int(127.0*(G-204.0)/51.0 + 0.5)
+
+            if R <= 51:
+                img[i][j][2] = 0
+            elif R <= 102:
+                img[i][j][2] = 0
+            elif R <= 153:
+                img[i][j][2] = (R-102)*5
+            elif G <= 204:
+                img[i][j][2] = 255
+            else : img[i][j][2] = 255
+    # cv2.imwrite(os.path.join(out_path,file_name),img)
+    return img
+
+
+# for onefile in filelist:
+#     img = cv2.imread(data_path + onefile)
+#     trans(onefile, img)
\ No newline at end of file